Source Code Cross Referenced for AFileRead.java in  » Web-Server » Rimfaxe-Web-Server » seda » apps » Haboob » cache » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » seda.apps.Haboob.cache 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * Copyright (c) 2001 by Matt Welsh and The Regents of the University of 
003:         * California. All rights reserved.
004:         *
005:         * Permission to use, copy, modify, and distribute this software and its
006:         * documentation for any purpose, without fee, and without written agreement is
007:         * hereby granted, provided that the above copyright notice and the following
008:         * two paragraphs appear in all copies of this software.
009:         * 
010:         * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
011:         * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
012:         * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
013:         * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
014:         * 
015:         * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
016:         * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
017:         * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
018:         * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
019:         * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
020:         *
021:         * Author: Matt Welsh <mdw@cs.berkeley.edu>
022:         * 
023:         */
024:
025:        package seda.apps.Haboob.cache;
026:
027:        import seda.apps.Haboob.*;
028:        import seda.sandStorm.api.*;
029:        import seda.sandStorm.core.*;
030:        import seda.sandStorm.lib.http.*;
031:        import seda.sandStorm.lib.aSocket.*;
032:        import seda.sandStorm.lib.aDisk.*;
033:        import seda.util.*;
034:        import java.io.*;
035:        import java.util.*;
036:
037:        /** 
038:         * This implementation of the Haboob "cache" does not actually
039:         * cache pages, but rather always reads them from files using
040:         * the Sandstorm AFile interface.
041:         */
042:        public class AFileRead implements  EventHandlerIF, HaboobConst {
043:
044:            private static final boolean DEBUG = false;
045:            private static final boolean PROFILE = true;
046:
047:            // Don't actually read file; just store empty buffer in cache
048:            private static final boolean DEBUG_NO_FILE_READ = true;
049:            // Don't even stat file; just allocate buffer of fixed size
050:            private static final boolean DEBUG_NO_FILE_READ_SAMESIZE = true;
051:            private static final int DEBUG_NO_FILE_READ_SAMESIZE_SIZE = 8192;
052:
053:            private String DEFAULT_URL;
054:            private String ROOT_DIR;
055:
056:            private SinkIF mysink, sendSink;
057:            private Hashtable aFileTbl;
058:
059:            private Hashtable mimeTbl; // Filename extension -> MIME type
060:            private static final String defaultMimeType = "text/plain";
061:
062:            public void init(ConfigDataIF config) throws Exception {
063:                mysink = config.getStage().getSink();
064:                sendSink = config.getManager().getStage(HTTP_SEND_STAGE)
065:                        .getSink();
066:                aFileTbl = new Hashtable();
067:
068:                mimeTbl = new Hashtable();
069:                mimeTbl.put(".html", "text/html");
070:                mimeTbl.put(".gif", "image/gif");
071:                mimeTbl.put(".jpg", "image/jpeg");
072:                mimeTbl.put(".jpeg", "image/jpeg");
073:                mimeTbl.put(".pdf", "application/pdf");
074:
075:                DEFAULT_URL = config.getString("defaultURL");
076:                if (DEFAULT_URL == null)
077:                    throw new IllegalArgumentException(
078:                            "Must specify defaultURL");
079:                ROOT_DIR = config.getString("rootDir");
080:                if (ROOT_DIR == null)
081:                    throw new IllegalArgumentException("Must specify rootDir");
082:            }
083:
084:            public void destroy() {
085:            }
086:
087:            public void handleEvent(QueueElementIF item) {
088:                if (DEBUG)
089:                    System.err.println("AFileRead: GOT QEL: " + item);
090:
091:                if (item instanceof  httpRequest) {
092:                    HaboobStats.numRequests++;
093:
094:                    httpRequest req = (httpRequest) item;
095:                    if (req.getRequest() != httpRequest.REQUEST_GET) {
096:                        HaboobStats.numErrors++;
097:                        sendSink
098:                                .enqueue_lossy(new httpResponder(
099:                                        new httpBadRequestResponse(req,
100:                                                "Only GET requests supported at this time"),
101:                                        req, true));
102:                        return;
103:                    }
104:
105:                    handleRequest(req);
106:
107:                } else if (item instanceof  AFileIOCompleted) {
108:                    AFileIOCompleted comp = (AFileIOCompleted) item;
109:                    AFile af = comp.getFile();
110:                    outstandingRead or = (outstandingRead) aFileTbl.get(af);
111:                    if (or == null) {
112:                        throw new RuntimeException(
113:                                "AFileRead: WARNING: Got AFileIOCompleted for non-entry: "
114:                                        + comp);
115:                    }
116:                    if (comp.sizeCompleted != or.length) {
117:                        throw new RuntimeException("AFileRead: WARNING: Got "
118:                                + comp.sizeCompleted
119:                                + " bytes read, expecting " + or.length);
120:                    }
121:                    af.close();
122:                    aFileTbl.remove(af);
123:                    or.done();
124:
125:                } else if (item instanceof  SinkClosedEvent) {
126:                    // Ignore
127:
128:                } else {
129:                    System.err.println("AFileRead: Got unknown event type: "
130:                            + item);
131:                }
132:
133:            }
134:
135:            public void handleEvents(QueueElementIF items[]) {
136:                for (int i = 0; i < items.length; i++) {
137:                    handleEvent(items[i]);
138:                }
139:            }
140:
141:            private void handleRequest(httpRequest req) {
142:                String url;
143:                String fname;
144:
145:                url = req.getURL();
146:                fname = ROOT_DIR + url;
147:
148:                AFile af = null;
149:                AFileStat stat;
150:                BufferElement payload = null;
151:                httpOKResponse resp;
152:                outstandingRead or;
153:
154:                if (DEBUG_NO_FILE_READ && DEBUG_NO_FILE_READ_SAMESIZE) {
155:                    resp = new httpOKResponse(getMimeType(fname),
156:                            DEBUG_NO_FILE_READ_SAMESIZE_SIZE);
157:                    or = new outstandingRead(req, resp, null,
158:                            DEBUG_NO_FILE_READ_SAMESIZE_SIZE);
159:
160:                } else {
161:
162:                    // Open file and stat it to determine size
163:                    try {
164:                        af = new AFile(fname, mysink, false, true);
165:                        stat = af.stat();
166:                        if (stat.isDirectory) {
167:                            af.close();
168:                            fname = fname + "/" + DEFAULT_URL;
169:                            af = new AFile(fname, mysink, false, true);
170:                            stat = af.stat();
171:                        }
172:
173:                        resp = new httpOKResponse(getMimeType(fname),
174:                                (int) stat.length);
175:                        payload = resp.getPayload();
176:
177:                    } catch (IOException ioe) {
178:                        // File not found
179:                        System.err.println("AFileRead: Could not open file "
180:                                + fname + ": " + ioe);
181:                        HaboobStats.numErrors++;
182:                        httpNotFoundResponse notfound = new httpNotFoundResponse(
183:                                req, ioe.getMessage());
184:                        sendSink.enqueue_lossy(new httpResponder(notfound, req,
185:                                true));
186:                        return;
187:                    }
188:
189:                    or = new outstandingRead(req, resp, af, (int) stat.length);
190:                }
191:
192:                if (!DEBUG_NO_FILE_READ || !DEBUG_NO_FILE_READ_SAMESIZE) {
193:                    aFileTbl.put(af, or);
194:                }
195:
196:                if (!DEBUG_NO_FILE_READ) {
197:                    try {
198:                        af.read(payload);
199:                    } catch (SinkException se) {
200:                        // XXX Should not really happen
201:                        System.err
202:                                .println("AFileRead: Got SinkException attempting read on "
203:                                        + fname + ": " + se);
204:                        aFileTbl.remove(af);
205:                        af.close();
206:                        HaboobStats.numErrors++;
207:                        httpNotFoundResponse notfound = new httpNotFoundResponse(
208:                                req, se.getMessage());
209:                        sendSink.enqueue_lossy(new httpResponder(notfound, req,
210:                                true));
211:                        return;
212:                    }
213:                } else {
214:                    // Pretend we got it already
215:                    if (!DEBUG_NO_FILE_READ_SAMESIZE) {
216:                        af.close();
217:                        aFileTbl.remove(af);
218:                    }
219:                    or.done();
220:                }
221:            }
222:
223:            private String getMimeType(String url) {
224:                Enumeration e = mimeTbl.keys();
225:                while (e.hasMoreElements()) {
226:                    String key = (String) e.nextElement();
227:                    if (url.endsWith(key))
228:                        return (String) mimeTbl.get(key);
229:                }
230:                return defaultMimeType;
231:            }
232:
233:            private class outstandingRead {
234:                httpOKResponse response;
235:                int length;
236:                boolean pending;
237:                int size;
238:                BufferElement buf;
239:                AFile af;
240:                ssLinkedList waiting;
241:                String url;
242:
243:                outstandingRead(httpRequest req, httpOKResponse resp, AFile af,
244:                        int size) {
245:                    this .response = resp;
246:                    this .length = resp.getPayload().size;
247:                    this .url = req.getURL();
248:                    this .af = af;
249:                    this .size = size;
250:                    pending = true;
251:                    waiting = new ssLinkedList();
252:                    addWaiter(req);
253:                }
254:
255:                synchronized void addWaiter(httpRequest req) {
256:                    waiting.add_to_tail(req);
257:                }
258:
259:                // Send response to all waiters when done reading
260:                synchronized void done() {
261:                    if (DEBUG)
262:                        System.err.println("AFileRead: Done with file read");
263:                    pending = false;
264:                    httpRequest waiter;
265:
266:                    while ((waiter = (httpRequest) waiting.remove_head()) != null) {
267:                        httpResponder respd = new httpResponder(response,
268:                                waiter);
269:                        sendSink.enqueue_lossy(respd);
270:                    }
271:                }
272:            }
273:
274:        }
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